There was a change a while back in which a lot of people ‘lost’ their badges.
From what I gather the company that runs the forums basicaaly changed all the names for the badges, (and i think they might have slightly altered the reqs), so that the leader badge became the elder badge, and the regular badge became the leader badge.
So you’re title got changed rather than you got demoted.

You can lose the new regular status if you’re inactive, or less so, for while. not sure if this is the same as it was before

Unlike other trust levels, you can lose trust level 3 status. If you dip below these requirements, whether from flagging or the passage of time, you will be demoted to Member. However, in order to avoid constant promotion/demotion situations, there is a 2-week grace period immediately after gaining Trust Level 3 during which you will not be demoted.

Edit: There’s also a forum thread on it, in the site that hosts(?) the TRS forumsDiscourse Meta